While working in the crime-ridden South Bronx in the 1970s, he was prolific when it came to taking down the perps who shot at him, pulled knives and pummeled him with everything from fists to a tire iron.

If cops had box scores, he’d be the Russell Westbrook of the NYPD.

The former NYPD detective has arrested more than 2,000 criminals.But, before they entered, a very nervous Fernandez — who wasn’t exactly a Boy Scout himself — whipped out a .38-caliber Smith & Wesson snub-nosed revolver.“Nice f - - king gun,” he quipped, letting Friedman know he could protect himself.She also appears in a recurring role in Chicago Fire.As of season 4, she is an officer with the Intelligence Unit.